PORTEVIN-LE CHATELIER EFFECT OF LA41 MAGNESIUM ALLOYS

Acta Metall Sin

2006, Vol. 42

Issue (2): 191-194 DOI:

Research Articles

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PORTEVIN-LE CHATELIER EFFECT OF LA41 MAGNESIUM ALLOYS

Cong Wang;;

中国科学院金属研究所

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Cong Wang. PORTEVIN-LE CHATELIER EFFECT OF LA41 MAGNESIUM ALLOYS. Acta Metall Sin, 2006, 42(2): 191-194 .

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Abstract Uni-axial tensile deformation of LA41 magnesium alloy has been carried out and PLC phenomenon, also known as serrated flow or plastic instability, is observed. This kind of alloy exhibits negative strain rate sensitivity (SRS) at room temperature, that is, SRS is negative throughout the strain rate range from 3.33×10-4 s-1 to 6.66×10-3 s-1 at ambient temperature. Both ultimate stress and 0.2% proof stress decrease with increasing strain rate, whilst critical strain of serrated flow is found to rise with enhanced strain rate. A new explanation for this unusual phenomenon is presented. The model of dynamic strain aging (DSA) is established though thorough discussion.

Key words: magnesium alloy PLC phenomenon dynamic strain aging strain rate sensitivity

Received: 07 June 2005

ZTFLH:

TG146.2

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I2/191

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